Researchers synthesized the polymeric nitrogen–hydrogen compound N3H2 at 134 to 139 GPa, revealing single-bonded nitrogen chains cross-linked by hydrogen bonds and directly locating hydrogen positions with synchrotron X-ray diffraction. Calculations estimate an ambient-pressure decomposition energy of 7.98 kJ/g, although the material is predicted to become unstable at low pressure and was not recovered to ambient conditions.
